mostrar notificaciones a los usuarios cuando alguien comenta en su

debate o responde a su comentario

db/migrate/20150928115005_create_notifications.rb

@@ -0,0 +1,9 @@
+class CreateNotifications < ActiveRecord::Migration
+  def change
+    create_table :notifications do |t|
+      t.belongs_to :user, index: true, foreign_key: true
+      t.belongs_to :activity, index: true, foreign_key: true
+      t.boolean :read, default: false
+    end
+  end
+end

db/schema.rb

@@ -204,6 +204,17 @@ ActiveRecord::Schema.define(version: 20151215165824) do
 
   add_index "moderators", ["user_id"], name: "index_moderators_on_user_id", using: :btree
 
+  create_table "notifications", force: :cascade do |t|
+    t.integer  "user_id"
+    t.integer  "activity_id"
+    t.boolean  "read",        default: false
+    t.datetime "created_at",                  null: false
+    t.datetime "updated_at",                  null: false
+  end
+
+  add_index "notifications", ["activity_id"], name: "index_notifications_on_activity_id", using: :btree
+  add_index "notifications", ["user_id"], name: "index_notifications_on_user_id", using: :btree
+
   create_table "organizations", force: :cascade do |t|
     t.integer  "user_id"
     t.string   "name",             limit: 60
@@ -405,5 +416,7 @@ ActiveRecord::Schema.define(version: 20151215165824) do
   add_foreign_key "identities", "users"
   add_foreign_key "locks", "users"
   add_foreign_key "moderators", "users"
+  add_foreign_key "notifications", "activities"
+  add_foreign_key "notifications", "users"
   add_foreign_key "organizations", "users"
 end